Dan, Michael really liked that rifle and was excited the day he got it (as he was all of them). I think you are correct on the attribution. Sure another will or may argue otherwise. 'Think' is the operative word here and there are certain instincts to looking at these old rifles. Most folks want to guard and preserve their integrity and reputation and you have certainly done so here. The attributes are strong, and the source is extremely reputable. I would not be able to make a case otherwise, so I am in agreement with you on the maker. Something about that 150 Lyman slide makes a Springfield look like it should to my eye. Very nice, hope you enjoy them.